/Engine/Source/Editor/KismetCompiler/Public/KismetCompiler.h
Reflects each pin's user set, default value into the function's metadata (so it can be queried for later by CallFunction nodes, etc.)
static void SetDefaultInputValueMetaData ( [UFunction](API\Runtime\CoreUObject\UObject\UFunction) * Function, const [TArray](API\Runtime\Core\Containers\TArray)< [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FUserPinInfo](API\Editor\BlueprintGraph\FUserPinInfo) > > & InputData )